Return to stock

Hey Guys
I have a telstra HTC one xl which is SOFF, unlocked bootloader and 2.15 firmware. I am currently running KickDroid XL v4.10 and am looking to sell my phone. I don't really want to sell a rooted phone so I would like to take it back to a stock Telstra rom. I have posted a pic of my bootloader details. I hope it attached as this is the first I have posted here because I normally work things out by reading lots of threads before I do anything to my phone. Please correct me if I am wrong but this is the way I think I should do it.
Change the CID back to Telstra and run this RUU - RUU_Evita_UL_Telstra_WWE_1.89.841.9_Radio_0.18c.32 .09.01_10.93a.32.20L_release_266699_signed.exe.
The things I really don't know about are, if I did this, can I get the updates to get to 4.2. and can I RUU that old version without any problems.
Any help would be greatly appreciated.
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Looks like my pic didn't work.
First 4 lines of my bootloader

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